JP2020158996A - Asphalt finisher - Google Patents

Abstract

To provide an asphalt finisher capable of suppressing or preventing theft.SOLUTION: An asphalt finisher 100 comprises: a tractor 1; a hopper 2; a conveyor CV that feeds a pavement material in the hopper 2 to the rear side of the tractor 1; a screw SC that lays the pavement material supplied by the conveyor CV to the rear of the tractor 1; a screed 3 that spreads and levels the pavement material laid by the screw SC on the back side of the screw SC; an imaging device 51 that images the surroundings of the asphalt finisher 100; a storage device 54 capable of storing an image imaged by the imaging device 51; and a controller 50 that detects people around the asphalt finisher 100. The controller 50 is configured to store the images imaged by the imaging device 51 in the storage device 54 when a person is detected when the asphalt finisher 100 is not operating.SELECTED DRAWING: Figure 3

Description

This disclosure relates to an asphalt finisher.

Conventionally, an asphalt finisher that prohibits the operation of a conveyor when it is detected that an image of a person is included in the image output by a camera that photographs the inside of the hopper using image recognition technology is known (patented). See Reference 1.).

Patent No. 5980105

However, the above-mentioned asphalt finisher is not configured to monitor the surroundings when the asphalt finisher is not in operation, such as at night or while parking. Therefore, the above configuration cannot prevent the theft of parts such as batteries or lamps or fuel.

In view of the above, it is desired to provide an asphalt finisher capable of suppressing or preventing theft.

The asphalt finisher according to the embodiment of the present invention includes a tractor, a hopper installed on the front side of the tractor to receive the pavement material, a conveyor for feeding the pavement material in the hopper to the rear side of the tractor, and the conveyor. The screed that spreads the pavement material fed by the tractor on the rear side of the tractor, the screed that spreads the pavement material spread by the screw on the rear side of the screw, and the periphery of the asphalt finisher are imaged. The control device includes an image pickup device, a storage device capable of storing an image captured by the image pickup device, and a control device for detecting a person existing around the asphalt finisher. The control device is operated by the asphalt finisher. When a person is detected when there is no person, the image captured by the imaging device is stored in the storage device.

By the means described above, an asphalt finisher capable of suppressing or preventing theft is provided.

It is a side view of the asphalt finisher which concerns on embodiment of this invention. It is a top view of the asphalt finisher of FIG. 1 which shows the image pickup range of an image pickup apparatus. It is a top view of the asphalt finisher of FIG. 1 showing the illumination range of a work light. It is a figure which shows the configuration example of the monitoring system mounted on the asphalt finisher of FIG. It is a flowchart of a start process. It is a flowchart of the detection process. It is a figure which shows another configuration example of the monitoring system mounted on the asphalt finisher of FIG.

FIG. 1 is a side view of an asphalt finisher 100, which is an example of a road machine according to an embodiment of the present invention. FIG. 2 is a top view of the asphalt finisher 100. The asphalt finisher 100 is mainly composed of a tractor 1, a hopper 2, and a screed 3. In the following, the direction of the hopper 2 as seen from the tractor 1 (+ X direction) is the front, and the direction of the screed 3 as seen from the tractor 1 (−X direction) is the rear. The road machine may be a base paver, a tack paver, a multi-asphalt paver, or the like.

The tractor 1 is a mechanism for running the asphalt finisher 100. In the present embodiment, the tractor 1 uses the rear wheel running hydraulic motor to rotate the rear wheels 5, and uses the front wheel running hydraulic motor to rotate the front wheels 6 to move the asphalt finisher 100. The rear wheel running hydraulic motor and the front wheel running hydraulic motor rotate by receiving the supply of hydraulic oil from the hydraulic pump. The rear wheels 5 and the front wheels 6 may be replaced by crawlers. The tractor 1 also includes a canopy 1C. The canopy 1C is attached to the upper part of the tractor 1. However, the canopy 1C may be omitted.

The controller 50 is a control device that controls the asphalt finisher 100. In the present embodiment, the controller 50 is composed of a microcomputer including a CPU, a timer, RAM, a ROM, and the like, and is mounted on the tractor 1. Various functions of the controller 50 are realized by the CPU executing the program stored in the ROM.

The hopper 2 is a mechanism for receiving a pavement material (for example, an asphalt mixture) from a dump truck, and mainly includes a hopper wing 20 and a hopper cylinder 24. In the present embodiment, the hopper 2 is installed on the front side of the tractor 1 and receives the pavement material in the hopper wing 20. The hopper wing 20 includes a left hopper wing 20L that can be opened and closed in the Y-axis direction (vehicle width direction) by the left hopper cylinder 24L, and a right hopper wing 20R that can be opened and closed in the Y-axis direction (vehicle width direction) by the right hopper cylinder 24R. including. The asphalt finisher 100 normally receives the pavement material from the loading platform of the dump truck with the hopper wing 20 fully open. FIG. 2 shows that the hopper wing 20 is in the fully open state. When the pavement material in the hopper 2 is reduced, when the operator closes the hopper wing 20, the pavement material near the inner wall of the hopper 2 is collected in the central portion of the hopper 2. This is so that the conveyor CV in the central portion of the hopper 2 can continuously feed the pavement material to the rear side of the tractor 1. That is, it is possible to maintain the state in which the pavement material is accumulated on the conveyor CV. After that, the pavement material fed to the rear side of the tractor 1 is spread in the vehicle width direction on the rear side of the tractor 1 and the front side of the screed 3 by the screw SC. In the present embodiment, the screw SC is in a state where the extension screw is connected to the left and right.

The screed 3 is a mechanism for laying out the pavement material. In this embodiment, the screed 3 includes a front screed 30 and a rear screed 31. The screed 3 is a floating screed towed by the tractor 1 and is connected to the tractor 1 via a leveling arm 3A. The posterior screed 31 includes a left posterior screed 31L and a right posterior screed 31R. The left rear screed 31L is expanded and contracted in the vehicle width direction using the left screed telescopic cylinder 26L, and the right rear screed 31R is expanded and contracted in the vehicle width direction using the right screed telescopic cylinder 26R.

The image pickup device 51 as a surrounding monitoring device is a device for acquiring an image. In this embodiment, the imaging device 51 is a monocular camera and is connected to the controller 50 wirelessly or by wire. Further, the image pickup apparatus 51 is configured so that the electric power stored in the battery BT mounted on the tractor 1 can be used even after the engine is turned off. The imaging device 51 as a surrounding monitoring device may be configured to be able to identify at least one of the type, position, shape, and the like of an object.

The controller 50 is configured so that, for example, a bird's-eye view image can be generated by performing a viewpoint conversion process on the image captured by the image pickup device 51. The bird's-eye view image is, for example, an image showing a state when the space around the asphalt finisher 100 is virtually viewed from substantially directly above. The image pickup device 51 as the ambient monitoring device may be a lidar, a thermo camera, an infrared camera, a stereo camera, or the like. In the present embodiment, the imaging device 51 includes a front camera 51F, a left camera 51L, a right camera 51R, and a rear camera 51B. The image pickup device 51 may include a camera that images the space directly above the tractor 1.

The front camera 51F images the space in front of the asphalt finisher 100. In the present embodiment, it is attached to the central portion of the front end of the bonnet constituting the front portion of the tractor 1 so that an image of the inside of the hopper 2 can be captured. It may be attached to the front part of the top plate of the canopy 1C. The region Z1 surrounded by the alternate long and short dash line in FIG. 2 indicates the imaging range of the front camera 51F.

The left camera 51L images the space to the left of the asphalt finisher 100. In this embodiment, the asphalt finisher 100 is attached to the left side of the top plate of the canopy 1C so that an image of the space on the left side can be captured. It may be attached to the left end of the bonnet. The region Z2 surrounded by the alternate long and short dash line in FIG. 2 shows the imaging range of the left camera 51L.

The right camera 51R images the space to the right of the asphalt finisher 100. In this embodiment, it is attached to the right side of the top plate of the canopy 1C so that an image of the space on the right side of the asphalt finisher 100 can be captured. It may be attached to the right end of the bonnet. The region Z3 surrounded by the alternate long and short dash line in FIG. 2 indicates the imaging range of the right camera 51R.

The rear camera 51B images the space behind the asphalt finisher 100. In this embodiment, it is attached to the rear part of the top plate of the canopy 1C so that the space behind the screed 3 can be imaged. It may be attached to the central portion of the rear end of the tractor 1. The region Z4 surrounded by the alternate long and short dash line in FIG. 2 indicates the imaging range of the rear camera 51B.

The controller 50 generates a bird's-eye view image by converting and synthesizing the images captured by each of the front camera 51F, the left camera 51L, the right camera 51R, and the rear camera 51B. The bird's-eye view image shows the space inside the hopper 2, the space on the left side of the asphalt finisher 100, the space on the right side of the asphalt finisher 100, and the space behind the screed 3 when viewed from substantially directly above. And a computer graphics image of the asphalt finisher 100 (top view of the asphalt finisher 100).

The display device 52 is a device that displays various images. In this embodiment, the display device 52 is a liquid crystal display and is wirelessly or wiredly connected to the controller 50. The display device 52 can display images captured by each of the plurality of image pickup devices 51, and is arranged at a position where the driver sitting in the driver's seat 1S can easily see the images. The display device 52 may be arranged at the rear controller RC. For example, the controller 50 causes the display device 52 to display an image generated by performing a viewpoint conversion process on the image captured by the image pickup device 51.

In this embodiment, the asphalt finisher 100 includes work lights W1 to W4. The work lights W1 to W4 are configured to illuminate a predetermined space by using the electric power generated by the generator mounted on the tractor 1 when the asphalt finisher 100 is in operation. Further, the work lights W1 to W4 are configured to illuminate a predetermined space by using the electric power of the battery BT mounted on the tractor 1 when the asphalt finisher 100 is not operating.

In the present embodiment, the work lights W1 to W4 are LED lamps. However, it may be a HID lamp, a halogen lamp, or the like. The work lights W1 to W4 are typically configured to be turned on and off by a switch. The switch is typically contained in an operation panel located in front of the driver's seat. However, the switch may be provided in another part of the asphalt finisher 100, such as an operation box installed in the screed 3. The work lights W1 to W4 may be configured to be switched on / off by one switch, or may be configured to be individually switched on / off by separate switches. Further, the work lights W1 to W4 may be configured to be turned on / off in response to a control command from the controller 50.

FIG. 3 is a top view of the asphalt finisher 100 showing the respective illumination ranges of the work lights W1 to W4, and corresponds to FIG.

The work light W1 illuminates diagonally forward of the asphalt finisher 100. In the present embodiment, the work light W1 is installed at the left end of the front end portion of the tractor 1 to illuminate the diagonally left front of the asphalt finisher 100, and the left headlight W1L is installed at the right end of the front end portion of the tractor 1 to be installed. Includes the right headlight W1R, which illuminates diagonally forward to the right. As shown in FIG. 3, the left headlight W1L illuminates the range R1L surrounded by the alternate long and short dash line. The right headlight W1R illuminates the range R1R surrounded by the alternate long and short dash line, as shown in FIG. The work light W1 may be attached to the front portion of the top plate of the canopy 1C.

The work light W2 illuminates the front of the tractor 1. In the present embodiment, as shown in FIG. 3, the work light W2 is installed at the center of the front end of the tractor 1 and illuminates the range R2 surrounded by the alternate long and short dash line including the inner region of the hopper 2. The work light W2 may be attached to the front portion of the top plate of the canopy 1C.

The work light W3 illuminates the space beside the tractor 1. In the present embodiment, the work light W3 is a left side light W3L installed on the left side surface of the tractor 1 to illuminate the space on the left side of the tractor 1, and a space on the right side of the tractor 1 installed on the right side surface of the tractor 1. Includes the right side light W3R, which illuminates. The left side light W3L illuminates the range R3L surrounded by the alternate long and short dash line, as shown in FIG. The right side light W3R illuminates the range R3R surrounded by the alternate long and short dash line, as shown in FIG. The work light W3 may be attached to the side portion of the top plate of the canopy 1C.

The work light W4 illuminates the space behind the screed 3. In the present embodiment, the work light W4 is installed at the rear of the top plate of the canopy 1C to illuminate the space behind the left rear of the screed 3, and the work light W4 is installed at the rear of the top plate of the canopy 1C. Includes a right backlight W4R that illuminates the space behind the right. The left backlight W4L illuminates the range R4L surrounded by the alternate long and short dash line, as shown in FIG. The right backlight W4R illuminates the range R4R surrounded by the alternate long and short dash line, as shown in FIG. The work light W3 may be attached to the rear part of the tractor 1.

Next, a configuration example of the monitoring system MS mounted on the asphalt finisher 100 will be described with reference to FIG. FIG. 4 is a diagram showing a configuration example of the monitoring system MS. The monitoring system MS is mainly composed of a controller 50, an image pickup device 51, a display device 52, an information acquisition device 53, a storage device 54, a transmission device 55, and the like. The monitoring system MS is configured to store the image captured by the imaging device 51 in the storage device 54 when, for example, a person existing around the asphalt finisher 100 is detected when the asphalt finisher 100 is not operating. Has been done. In this case, the monitoring system MS may be configured to store the image captured by the imaging device 51 in the storage device 54 so as not to be overwritten. Further, when the asphalt finisher 100 is in operation, the monitoring system MS refers to an image for display (hereinafter referred to as “output image”) based on an image captured by the image pickup device 51 (hereinafter referred to as “input image”). ) Is generated and the output image is displayed on the display device 52.

The information acquisition device 53 acquires information about the asphalt finisher 100 and outputs the acquired information to the controller 50. The information acquisition device 53 includes, for example, at least one of an ignition switch, a microphone, an illuminance sensor, a positioning device, and the like. The ignition switch detects the on / off state of the engine that is the drive source of the asphalt finisher 100. The microphone detects sounds generated around the asphalt finisher 100. The illuminance sensor detects the ambient brightness of the asphalt finisher 100. The positioning device is, for example, a GNSS compass, which detects the position (latitude, longitude, altitude) and orientation of the asphalt finisher 100.

The storage device 54 is a device for storing various types of information. In the present embodiment, the storage device 54 is a non-volatile storage device that stores the input image / output image correspondence map in a reference manner, and is mounted on the tractor 1 as shown in FIGS. 1 and 2.

The input image / output image correspondence map stores the correspondence between the coordinates on the input image plane and the coordinates on the output image plane. The correspondence is preset based on various parameters such as the optical center of the image pickup apparatus 51, the focal length, the CCD size, the optical axis direction vector, the camera horizontal direction vector, and the projection method so that the desired viewpoint conversion can be realized. There is. The correspondence may be set so that apparent distortion and tilt do not appear in the output image.

The transmission device 55 is configured to be able to transmit the information possessed by the asphalt finisher 100 to the outside. In this embodiment, the transmission device 55 is mounted on the tractor 1 as shown in FIGS. 1 and 2. Then, the transmission device 55 transmits the information possessed by the asphalt finisher 100 to an external device via a communication network NW such as a short-range wireless communication network, a mobile phone communication network, or a satellite communication network. The external device includes, for example, a management device MD such as a server installed in a management center or the like, or a support device AD such as a smartphone carried by the owner or a related person such as the manager of the asphalt finisher 100.

The controller 50 includes functional elements such as a viewpoint conversion unit 50a and a person detection unit 50b. Each functional element consists of software, hardware or firmware. In this embodiment, each functional element is composed of software.

The viewpoint conversion unit 50a is a functional element that generates an output image. In the present embodiment, the viewpoint conversion unit 50a refers to the input image / output image correspondence map stored in the storage device 54, and the coordinates on the input image plane where the input image captured by the image pickup device 51 is located and the output image. Corresponds to the coordinates on the output image plane where the bird's-eye view image is located. Specifically, the viewpoint conversion unit 50a associates the value of each pixel in the input image (for example, a luminance value, a hue value, a saturation value, etc.) with the value of each pixel in the output image to generate the output image. Generate.

In the present embodiment, the controller 50 refers to the input image / output image correspondence map by the viewpoint conversion unit 50a. Then, the values (for example, luminance value, hue value, saturation value, etc.) possessed by the coordinates on the input image plane corresponding to each coordinate on the output image plane are acquired, and the acquired values correspond to the acquired values. It is used as the value of each coordinate on the output image plane.

After that, the controller 50 determines whether or not all the coordinate values on the output image plane are associated with the coordinate values on the input image plane. If it is determined that the values of all the coordinates are not yet associated, the above process is repeated until the values of all the coordinates are associated.

With this configuration, the controller 50 can display the bird's-eye view image on the display device 52 while the asphalt finisher 100 is in operation.

The person detection unit 50b is a functional element that detects a person existing around the asphalt finisher 100. In the present embodiment, the person detection unit 50b detects a person by applying a known image recognition technique to the image captured by the image pickup apparatus 51 when the asphalt finisher 100 is not in operation. Therefore, the battery BT mounted on the tractor 1 is configured so that the electric power stored in the battery BT is supplied to the human detection unit 50b even after the engine is turned off. Then, when the person detection unit 50b detects a person, the person detection unit 50b stores the image captured by the image pickup device 51 in a predetermined storage area in the storage device 54. This is to prevent it from being overwritten, that is, to prevent it from being erased. Specifically, the controller 50 continuously stores the image continuously captured by the image pickup device 51 in the ring buffer area of the storage device 54. Then, when the person is detected, the person detection unit 50b stores the image stored in the ring buffer area in a predetermined period including the time when the person is detected in a predetermined storage area other than the ring buffer area. The person detection unit 50b may directly store the image captured by the image pickup apparatus 51 after detecting a person in a predetermined storage area without storing the image in the ring buffer area. In addition, the predetermined period may include a period before the time when a person is detected.

When a person is detected when the asphalt finisher 100 is not operating, the person detection unit 50b may be configured to notify the outside that the person has been detected. In the present embodiment, the person detection unit 50b is configured to send a text message indicating that a person has been detected and an image stored in a predetermined storage area to the persons concerned. It may be configured to send only text messages. In addition, the images sent to the parties concerned may be all or a part of the images stored in the predetermined storage area. Further, the image sent to the persons concerned may be a still image or a moving image.

The human detection unit 50b may execute the same process when the asphalt finisher 100 is in operation.

Next, the operation of the monitoring system MS when the asphalt finisher 100 is not operating will be described with reference to FIGS. 5 and 6. FIG. 5 is a flowchart showing an example of the flow of a process (hereinafter, referred to as “starting process”) in which the monitoring system MS activates the detection process. The detection process is a process in which the controller 50 detects a person existing around the asphalt finisher 100 when the asphalt finisher 100 is not operating. FIG. 6 is a flowchart showing an example of the flow of the detection process. The controller 50 repeatedly executes this activation process at a predetermined control cycle when the asphalt finisher 100 is in operation. Then, the controller 50 repeatedly executes this detection process at a predetermined control cycle when the asphalt finisher 100 is not in operation.

As shown in FIG. 5, when the asphalt finisher 100 is in operation, the controller 50 monitors whether or not the engine has been turned off (step ST1). In the present embodiment, the controller 50 determines whether or not the engine has been turned off based on the output of the ignition switch, which is one of the information acquisition devices 53.

If it is determined that the engine is not turned off (NO in step ST1), the controller 50 repeats step ST1 until the engine is turned off. In the present embodiment, when the controller 50 determines that the engine is not turned off, that is, the asphalt finisher 100 is in operation based on the output of the ignition switch, the controller 50 repeats step ST1 until the engine is turned off.

When it is determined that the engine has been turned off (YES in step ST1), the controller 50 activates the image pickup device 51 (step ST2). In the present embodiment, when the monitoring mode is set to ON, the controller 50 activates the image pickup device 51 when it determines that the engine has been turned off. This is to monitor the surroundings of the asphalt finisher 100 when the asphalt finisher 100 is not in operation. In this case, the controller 50 may activate the microphone, which is one of the information acquisition devices 53. When the monitoring mode is set to off, the controller 50 does not start the imaging device 51 even when it is determined that the engine has been turned off.

Persons concerned, including the operator of the asphalt finisher 100, can set the monitoring mode on / off, for example, via the operation panel. The person concerned may switch the monitoring mode on / off by remote control via wireless communication. With this configuration, an operator who performs maintenance on the asphalt finisher 100 can perform maintenance on the asphalt finisher 100 after stopping the detection process by setting the monitoring mode to off by remote control.

Alternatively, the monitoring mode may be configured to automatically switch on at a predetermined time. This is to enable detection of a person approaching the asphalt finisher 100 in a preset time zone such as a time other than the scheduled working time.

However, the controller 50 may unconditionally activate the image pickup device 51 when it is determined that the engine has been turned off. Further, the controller 50 may activate the image pickup device 51 when the asphalt finisher 100 exists in a place other than a predetermined parking lot based on the output of the positioning device regardless of the state of the engine.

When the image pickup apparatus 51 is activated, the controller 50 starts the detection process (step ST3). In the present embodiment, the controller 50 starts the detection process after activating the image pickup apparatus 51.

In the detection process shown in FIG. 6, the controller 50 determines whether or not a person has been detected (step ST11). In the present embodiment, the controller 50 determines whether or not a person is detected within a predetermined range set around the asphalt finisher 100 based on the image captured by the image pickup device 51. Therefore, the predetermined range is included in the imaging range of the imaging device 51. That is, the monitoring range of the monitoring system MS is included in the imaging range of the imaging device 51.

When determining whether or not a person has been detected, the controller 50 may operate a lighting device such as work lights W1 to W4, if necessary. In the present embodiment, the controller 50 operates at least one of the work lights W1 to W4 when it is determined that the ambient brightness (illuminance) of the asphalt finisher 100 is less than a predetermined value based on the output of the illuminance sensor. .. This is to ensure the brightness required for the controller 50 to detect a person. However, when the image pickup device 51 is an infrared camera or a thermo camera, the controller 50 does not have to operate the lighting device.

The controller 50 may be configured to detect a person candidate who stays within a predetermined range for a predetermined time or longer as a person. The person candidate is an object determined by the controller 50 to be a person. In other words, even if the controller 50 detects a person candidate within a predetermined range, if the person candidate does not stay within the predetermined range for a predetermined time or more, the controller 50 is configured not to detect the person as a person. May be good. In this case, the controller 50 does not detect the person candidate who has been within the predetermined range for a short time as a person. This is to prevent an excessive amount of information from being stored in a predetermined storage area or being transmitted to the outside.

Alternatively, the controller 50 may be configured to detect as a person a candidate who has touched or is about to touch the asphalt finisher 100. In other words, even if the controller 50 detects a person candidate within a predetermined range, if the person candidate does not touch the asphalt finisher 100 or does not try to touch it, the controller 50 does not detect it as a person. It may be configured in. In this case, the controller 50 determines whether or not the candidate has touched or is about to touch the asphalt finisher 100 based on the image captured by the imaging device 51. This is to prevent an excessive amount of information from being stored in a predetermined storage area or being transmitted to the outside.

Specifically, the controller 50 may be configured to transmit information to the outside when it detects a person who has touched or is about to touch the cover 1D (see FIG. 1) of the tractor 1. .. The cover 1D of the tractor 1 is provided with, for example, a left front cover 1DF covering the internal space on the left front side of the tractor 1 in which the fuel tank filler port FC (see FIGS. 1 and 2) is arranged, and a battery BT. The left rear cover 1 DB and the like covering the internal space on the left rear side of the tractor 1 are included.

Alternatively, when the controller 50 detects a person who has boarded or is about to board the tractor 1 in order to approach the tool box TL (see FIG. 2) or the like housed under the driver's seat 1S of the asphalt finisher 100. It may be configured to send information to the outside.

If it is determined that no person has been detected (NO in step ST11), the controller 50 repeats step ST11 until it is determined that a person has been detected.

When it is determined that a person has been detected (YES in step ST11), the controller 50 transmits information about the asphalt finisher 100 to the outside (step ST12). In the present embodiment, the controller 50 is configured to send a text message indicating that a person has been detected and an image stored in a predetermined storage area to related parties.

For example, when the controller 50 detects a person, the controller 50 may transmit the stored image for a predetermined time at a predetermined interval to the outside. For example, the controller 50 may transmit the moving image stored in the last 5 seconds to the outside every 30 seconds.

Next, another configuration example of the monitoring system MS will be described with reference to FIG. 7. FIG. 7 shows another configuration example of the monitoring system MS. The monitoring system MS of FIG. 7 is different from the monitoring system MS of FIG. 4 in that the person detection unit 50b detects a person based on the information acquired by the information acquisition device 53 and the reception device 56 is provided. In other respects, it is the same as the monitoring system MS of FIG. Therefore, the explanation of the common part is omitted, and the difference part is explained in detail.

In the monitoring system MS of FIG. 7, the person detection unit 50b is configured to detect a person based on the information acquired by the information acquisition device 53. The information acquisition device 53 includes, for example, an object detection sensor composed of a pyroelectric infrared sensor, an ultrasonic sensor, or the like. In this case, the person detection unit 50b activates the image pickup device 51 when the person is detected based on the output of the object detection sensor. That is, the image pickup device 51 is not activated until a person is detected.

The information acquisition device 53 may include an open / close sensor that detects that the cover 1D of the tractor 1 has been opened. The open / close sensor may be, for example, a contact sensor such as a limit switch or a non-contact sensor such as a proximity sensor. In this case, the human detection unit 50b activates the image pickup device 51 when it detects that the cover 1D has been opened based on the output of the open / close sensor. That is, the image pickup apparatus 51 is not activated until the cover 1D is opened.

The information acquisition device 53 may include a vibration sensor that detects that a person has boarded the tractor 1. In this case, the person detection unit 50b activates the image pickup device 51 when it detects that a person has entered the tractor 1 based on the output of the vibration sensor. That is, the image pickup device 51 is not activated until a person gets into the tractor 1. In this case, the imaging device 51 may include a camera that images the space directly above the tractor 1.

The receiving device 56 is configured to be able to receive a signal transmitted by the transmitter TM carried by a person concerned such as the owner or the manager of the asphalt finisher 100. Then, when the receiving device 56 receives the signal transmitted by the transmitter TM, the person detection unit 50b does not notify the outside that the person has been detected even when the person is detected. It is configured. When the receiving device 56 receives the signal transmitted by the transmitter TM, the person detecting unit 50b stores the image captured by the imaging device 51 in the ring buffer area even when the receiving device 56 detects a person. , It may be configured not to store in a predetermined storage area. This is because it can be estimated that a person who is not a suspicious person exists around the asphalt finisher 100. That is, it can be determined that there is no risk of theft of parts such as battery BT or lighting device or fuel.

In the monitoring system MS of FIG. 7, the person detection unit 50b detects a person based on the information acquired by the information acquisition device 53, activates the image pickup device 51, and then renews the information acquired by the information acquisition device 53. And the image captured by the image pickup device 51 may be used to detect a person.

As described above, the asphalt finisher 100 according to the embodiment of the present invention has the tractor 1, the hopper 2 installed on the front side of the tractor 1 and accepting the pavement material, and the pavement material in the hopper 2 to the rear side of the tractor 1. The conveyor CV to be fed, the pavement SC to spread the pavement material fed by the conveyor CV on the rear side of the tractor 1, and the screed 3 to spread the pavement material spread by the screw SC on the rear side of the screw SC. An image pickup device 51 that images the surroundings of the asphalt finisher 100, a storage device 54 that can store the image captured by the image pickup device 51, and a controller 50 as a control device that detects a person existing around the asphalt finisher 100. , Is equipped. The controller 50 is configured to store the image captured by the image pickup device 51 in the storage device 54 when a person is detected when the asphalt finisher 100 is not operating.

With this configuration, the asphalt finisher 100 can suppress or prevent theft of parts such as the battery BT or work lights W1 to W4 or fuel. Therefore, the asphalt finisher 100 can improve the crime prevention property.

Desirably, when a person is detected, the controller 50 is configured to notify the outside that the person has been detected. With this configuration, the asphalt finisher 100 can promptly inform the concerned parties that a suspicious person is around the asphalt finisher 100.

The asphalt finisher 100 may include a sensor that detects that a predetermined action has been performed on the asphalt finisher 100. This sensor includes, for example, an open / close sensor that detects that the cover 1D of the tractor 1 has been opened, a vibration sensor that detects that a person has entered the tractor 1, and the like. The predetermined action includes, for example, opening the cover 1D, getting into the tractor 1, and the like. In this case, the controller 50 is configured to notify the outside that the person has been detected when the person is detected and when the sensor as described above detects that a predetermined action has been performed. You may be. With this configuration, the asphalt finisher 100 can prevent information that does not need to be notified to the outside from being frequently transmitted to the outside.

The controller 50 is preferably configured to detect a person based on at least one of the images captured by the image pickup device 51 and the information acquired by the information acquisition device 53. With this configuration, the asphalt finisher 100 can detect a person existing around the asphalt finisher 100 with high accuracy when the asphalt finisher 100 is not in operation.

The controller 50 may be configured to notify the outside that a person has been detected when the person is detected in a preset time zone. With this configuration, the asphalt finisher 100 can automatically activate the detection process even if, for example, the operator forgets to set the monitoring mode on.

The controller 50 may be configured to notify the outside that a person has been detected when a person is detected in a preset space. With this configuration, the asphalt finisher 100 can prevent even a person outside the preset space from being detected as a suspicious person.

When a predetermined signal is received, the controller 50 may be configured so as not to notify the outside that a person has been detected. With this configuration, the asphalt finisher 100 can prevent even the persons concerned with the asphalt finisher 100 from being detected as suspicious persons.

The preferred embodiment of the present invention has been described above. However, the present invention is not limited to the above-described embodiments. Various modifications, substitutions, etc. can be applied to the above-described embodiments without departing from the scope of the present invention. In addition, each of the features described with reference to the above-described embodiments may be appropriately combined as long as there is no technical conflict.

For example, the imaging device 51 may include an omnidirectional camera as a camera that monitors the surroundings of the asphalt finisher 100 when the asphalt finisher 100 is not in operation.

Further, in the above-described embodiment, the monitoring system MS is configured to detect a person existing around the asphalt finisher 100 based on the image captured by the image pickup device 51 arranged so as to generate a bird's-eye view image. ing. However, the monitoring system MS may be configured to detect a person present around the asphalt finisher 100 based on an image captured by the imaging device, which has nothing to do with the generation of the bird's-eye view image. In this case, the image pickup apparatus 51 arranged so as to generate a bird's-eye view image may be omitted.

1 ... tractor 1S ... driver's seat 2 ... hopper 3 ... screed 3A ... leveling arm 5 ... rear wheel 6 ... front wheel 20 ... hopper wing 20L ... left hopper Wing 20R ・ ・ ・ Right hopper wing 24 ・ ・ ・ Hopper cylinder 24L ・ ・ ・ Left hopper cylinder 24R ・ ・ ・ Right hopper cylinder 26 ・ ・ ・ Screed telescopic cylinder 26L ・ ・ ・ Left screed telescopic cylinder 26R ・ ・ ・ Right screed telescopic cylinder Cylinder 30 ... Front screed 31 ... Rear screed 50 ... Controller 50a ... Viewpoint conversion unit 50b ... Human detection unit 51 ... Imaging device 51B ... Rear camera 51F ... Front Camera 51L ・ ・ ・ Left camera 51R ・ ・ ・ Right camera 52 ・ ・ ・ Display device 53 ・ ・ ・ Information acquisition device 54 ・ ・ ・ Storage device 55 ・ ・ ・ Transmission device 56 ・ ・ ・ Receiver device 100 ・ ・ ・ Asphalt finisher AD ... Support device CV ... Conveyor MD ... Management device MS ... Monitoring system NW ... Communication network SC ... Cylinder

Claims (7)

With a tractor
A hopper installed on the front side of the tractor to receive pavement material,
A conveyor that feeds the pavement material in the hopper to the rear side of the tractor,
A screw that spreads the pavement material fed by the conveyor behind the tractor, and
A screed that spreads the pavement material spread by the screw on the rear side of the screw, and
An imaging device that images the surroundings of the asphalt finisher,
A storage device that can store images captured by the image pickup device, and
A control device for detecting a person existing around the asphalt finisher is provided.
The control device is configured to store an image captured by the image pickup device in the storage device when a person is detected when the asphalt finisher is not operating.
Asphalt finisher. When a person is detected, the control device is configured to notify the outside that the person has been detected.
The asphalt finisher according to claim 1. It is equipped with a sensor that detects that a predetermined action has been performed on the asphalt finisher.
The control device is configured to notify the outside that a person has been detected when a person is detected and when a predetermined action is detected by the sensor.
The asphalt finisher according to claim 1 or 2. The control device is configured to detect a person based on at least one of an image captured by the image pickup device and information acquired by the information acquisition device.
The asphalt finisher according to any one of claims 1 to 3. The control device is configured to notify the outside that a person has been detected when a person is detected in a preset time zone.
The asphalt finisher according to any one of claims 1 to 4. When a person is detected in a preset space, the control device is configured to notify the outside that the person has been detected.
The asphalt finisher according to any one of claims 1 to 5. When a predetermined signal is received, the control device is configured so as not to notify the outside that a person has been detected.
The asphalt finisher according to any one of claims 1 to 6.